There are two crucial factors: the transmissibility of the virus, and its virulence.
有两个关键因素：病毒的传播性和其毒性。
A number of factors play a crucial role in the virulence and pathogenesis of infection.
有若干因素中起着重要作用的毒力和感染发病。
A number of factors play a crucial role in the virulence and pathogenesis of infection.
有若干因素中起着重要作用的毒力和感染发病。
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